def validate_username(form, field): form.user = UserMgr.one(username=field.data) if form.user is None: msg = field.data + " isn't a registered user." raise val.StopValidation(msg)
def validate_username(form, field): if UserMgr.one(username=field.data): msg = "Username {} is taken".format(field.data) raise wtforms.ValidationError(msg)